COVER The coaxial cable, long used for demanding electrical applications, has now been used as a model for improving glass optical fibers. A model study demonstrates how light dispersion and polarization shifts that occur in traditional optical fibers can be overcome when light travels through an all-dielectric coaxial cable whose inner and outer walls are made of omnidirectionally reflecting multilayer films, as shown by the model's electromagnetic fields seen here. See page 415. [Image: M. Ibanescu et al.]

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